Weird navigation issue

We have a sub site set up in our site collection, that when you click on any ofthe navigation links to it, takes you to a 404 page. Hitting the back buttonwill bring you to the page that you originally intented to go to. Has anyoneever come across this, and if so, how do you fix it?

Go4Sharepoint, is a Microsoft Featured Community.
Microsoft, Windows, Sharepoint, Sharepoint logo, Windows logo, etc are trademarks of the Microsoft Corporation.
All product names, logos, copyrights, and trademarks mentioned are acknowledged as the registered intellectual property of their respective owners. This site is not in any way affiliated with, nor has it been authorized, sponsored, or otherwise approved by, Microsoft Corporation.